scholarly journals Short Communication: Survival and growth of mono and mixed species plantations on the Coromandel coast of India

2017 ◽  
Vol 1 (2) ◽  
pp. 70-76 ◽  
Author(s):  
M. ANBARASHAN ◽  
A. PADMAVATHY ◽  
R. ALEXANDAR
Keyword(s):  
Survival Rate ◽  
Short Communication ◽  
Coastal Region ◽  
Growth Parameter ◽  
Single Species ◽  
Casuarina Equisetifolia ◽  
Mixed Species ◽  
Survival And Growth ◽  
The Tropics ◽  
Coromandel Coast

Anbarashan M, Padmavathy A, Alexandar R. 2017. Short Communication: Survival and growth of mono and mixed species plantations on the Coromandel coast of India. Asian J For 1: 70-76. There exists very little information on the growth of autochthonous tree species autochthonousin the tropics and on the experiences in conducting mono and mixed species plantations. The aim of this study was to compare the variation in growth parameter between the mixed species plantation and mono species plantation. The growth, survival, and height of 82 autochthonous mixed species plantations were compared with Casuarina equisetifolia, an exotic species broadly planted in this region after over a decade (2006 to 2016). In the mixed species plantation, seven species showed 100 % survival rate and 19 species were not survived after 10-year intervals. In the mono species plantation, Casuarina equisetifolia had 92 % of the survival rate. When it is compared to the mono plantation, the growth rate of mixed species plantation showed highly significant differences (P < 0: 05) values. Simple linear regression between annual girth increment and height produced very strong positive relations (R2 0.759). Plantations of Casuarina equisetifolia seem to be well adapted to the coastal region. On the other hand, mixed plantation with autochthonous species would contribute more to sustainable management because they provide a greater range of ecological goods and ecosystem services than the single species plantations.

From single-species advice to mixed-species management: taking the next step

2004 ◽  
Vol 61 (8) ◽  
pp. 1398-1409 ◽  
Author(s):  
Morten Vinther ◽  
Stuart A. Reeves ◽  
Kenneth R. Patterson
Keyword(s):  
North Sea ◽  
Fishery Management ◽  
Single Species ◽  
Mixed Species ◽  
The North ◽  
Recent Approach ◽  
Starting Point ◽  
The North Sea ◽  
Management Advice ◽  
Management Priorities

Abstract Fishery management advice has traditionally been given on a stock-by-stock basis. Recent problems in implementing this advice, particularly for the demersal fisheries of the North Sea, have highlighted the limitations of the approach. In the long term, it would be desirable to give advice that accounts for mixed-fishery effects, but in the short term there is a need for approaches to resolve the conflicting management advice for different species within the same fishery, and to generate catch or effort advice that accounts for the mixed-species nature of the fishery. This paper documents a recent approach used to address these problems. The approach takes the single-species advice for each species in the fishery as a starting point, then attempts to resolve it into consistent catch or effort advice using fleet-disaggregated catch forecasts in combination with explicitly stated management priorities for each stock. Results are presented for the groundfish fisheries of the North Sea, and these show that the development of such approaches will also require development of the ways in which catch data are collected and compiled.

scholarly journals Effect of cattle and wildlife exclusion areas on the survival and growth of Pinus culminicola Andresen & Beaman

2018 ◽  
Vol 5 (13) ◽  
pp. 157 ◽  
Author(s):  
Javier Jiménez Pérez ◽  
José Israel Israel Yerena Yamallel ◽  
Eduardo Alanís Rodríguez ◽  
Oscar Alberto Aguirre Calderón ◽  
René Alejandro Martínez Barrón
Keyword(s):  
Survival Rate ◽  
Small Mammals ◽  
Small Mammal ◽  
Weather Conditions ◽  
Height Growth ◽  
Natural Area ◽  
Free Range ◽  
Protected Natural Area ◽  
Causes Of Mortality ◽  
Survival And Growth

In 1997, a restoration of Pinus culminicola was established under three exclusion areas: E1 = cattle plus small mammal exclusion, E2 = cattle exclusion and E3 = no exclusion (free range), in the Cerro El Potosi Protected Natural Area, located in Nuevo León, Mexico. The objective of this study was to determine the survival rate and the increase in diameter and height of Pinus culminicola individuals at three and 17 years after planting. The results show differences between 2000 and 2014 in survival rate and diameter and height growth in the three exclusion areas; E1 and E2 recorded higher averages. The main causes of mortality in this species are attributed to extreme weather conditions and the damage caused by cattle and small mammals.

scholarly journals Estimation of the relative abundance of species in artificial mixtures of insects using low-coverage shotgun metagenomics

2020 ◽  
Vol 4 ◽  
Author(s):  
Lidia Garrido-Sanz ◽  
Miquel Àngel Senar ◽  
Josep Piñol
Keyword(s):  
Relative Abundance ◽  
Species Abundance ◽  
Single Species ◽  
Insect Species ◽  
Individual Species ◽  
Advanced Degree ◽  
Mixed Species ◽  
Species List ◽  
Shotgun Metagenomics ◽  
Low Coverage

Amplicon metabarcoding is an established technique to analyse the taxonomic composition of communities of organisms using high-throughput DNA sequencing, but there are doubts about its ability to quantify the relative proportions of the species, as opposed to the species list. Here, we bypass the enrichment step and avoid the PCR-bias, by directly sequencing the extracted DNA using shotgun metagenomics. This approach is common practice in prokaryotes, but not in eukaryotes, because of the low number of sequenced genomes of eukaryotic species. We tested the metagenomics approach using insect species whose genome is already sequenced and assembled to an advanced degree. We shotgun-sequenced, at low-coverage, 18 species of insects in 22 single-species and 6 mixed-species libraries and mapped the reads against 110 reference genomes of insects. We used the single-species libraries to calibrate the process of assignation of reads to species and the libraries created from species mixtures to evaluate the ability of the method to quantify the relative species abundance. Our results showed that the shotgun metagenomic method is easily able to set apart closely-related insect species, like four species of Drosophila included in the artificial libraries. However, to avoid the counting of rare misclassified reads in samples, it was necessary to use a rather stringent detection limit of 0.001, so species with a lower relative abundance are ignored. We also identified that approximately half the raw reads were informative for taxonomic purposes. Finally, using the mixed-species libraries, we showed that it was feasible to quantify with confidence the relative abundance of individual species in the mixtures.

scholarly journals The effects of differences in water exchange on the productivity of glass eel stage in Anguilla bicolor bicolor culture

2021 ◽  
Vol 322 ◽  
pp. 02006
Author(s):  
Eri Setiadi ◽  
Adang Saputra ◽  
Imam Taufik
Keyword(s):  
Water Quality ◽  
Blood Glucose ◽  
Survival Rate ◽  
Quality Management ◽  
Water Exchange ◽  
Water Quality Management ◽  
Economic Value ◽  
Culture Technique ◽  
Glass Eel ◽  
Survival And Growth

Eel, Anguilla bicolor bicolor has an economic value for export commodity. Eel farming has been developed both of home to industries scales. However, the main problem during the glass eel culture is the low survival rate, characterized by high mortality. This condition is related to the culture technique that has not been established yet, especially water quality management. The research aims to determine the best water exchange during the culture of the glass eel on the survival, growth, and blood glucose. The different percentages of water exchange as a treatment were followed A) control (without water exchange); B) 20% of water exchange; C) 40% of water exchange; and D) 60% of water exchange. The water exchange has affected the survival, growth, and blood glucose (P<0.05). The ammonia, nitrite, and nitrate values during the culture period showed that the control was higher compared to the others. The water exchange of 40% is suitable for glass eel stage culture to obtain the best survival and growth.

scholarly journals Mangrove Rehabilitation at Alo Beach (Karakelang Islands, Talaud) Using Propagul of Rhizophora mucronata Lamk

Jurnal Wasian ◽  
2017 ◽  
Vol 4 (2) ◽  
pp. 69
Author(s):  
Ady Suryawan
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Rhizophora Mucronata ◽  
Randomized Design ◽  
Waves And Tides ◽  
Survival And Growth ◽  
Mangrove Rehabilitation ◽  
Main Factor

This study aimed to know the dynamic of survival rate and growth of Rhizophora mucronata Lamk which planted by using propagules at Alo Beach, Karakelang Island, Talaud. The study was conducted from June 2013 to April 2017, used a complete randomized design with 6 treatments i.e. K1, K2, K3, K4, K5, K6. The amount of propagules in every treatment were 100 pieces each. The parameter observed were characteristic of substrat, survival rate,height and diameter of the plant’s in age of 1.5 months and 48 months. The results showed that treatment had a significant effect on survival rate and growth of Rhizophora mucronata plants. The rehabilitation was categorized as success at 1.5 months old, but it was failed inthe 48 months. Beside waves and tides, low substrat nutrition became the main factor that affect the success of mangrove rehabilitation in Alo Beach.The K5 treatment has the highest survival and growth rate of the plant. The K5 treatment using pnematophore as brace, while planting without brace/K1 has lowest survival and growth rate since months old.Keywords: mangroves, rehabilitation, Rhizophora mucronata, Talaud

Effect of different substrates on survival and growth of juveniles of the freshwater narrow-clawed crayfish Astacus leptodactylus Eschscholtz, 1823 (Decapoda, Astacidae)

Crustaceana ◽  
2017 ◽  
Vol 90 (11-12) ◽  
pp. 1289-1302 ◽  
Author(s):  
Yavuz Mazlum ◽  
Ozlem Guner Gurlek ◽  
Sinem Sirin
Keyword(s):  
Survival Rate ◽  
Treatment Group ◽  
Total Yield ◽  
Control Group ◽  
Astacus Leptodactylus ◽  
Growth Increase ◽  
Key Factor ◽  
Flow Through ◽  
Survival And Growth ◽  
Intermediate Value

Substrate is a key factor for successful crayfish culture, and it can be used to increase the survival rate. The effects of substrate on the survival and growth ofAstacus leptodactylusEschscholtz, 1823 were evaluated in flow-through compartments, divided into three sections and with two different substrates, over a period of 90 days. The three treatments used in the study were: artificial ropes, small stones, and a control group that received no substrate. The survival rate was highest in the small-stones treatment group (77.3%) and was lowest in the without-substrate treatment group (41.3%), while the artificial-ropes group showed an intermediate value (65.3%). Total yield was lower in the control group, 22.46% (25.0 g) as compared to the small-stones treatment group, with 42.3% (51.3 g) and the artificial-ropes treatment with 35.51% (55.8 g). In addition, cheliped injuries were found in higher proportion in the group without cover, and the artificial ropes yielded better results compared to the small-stones and no-substrate group in regard of the growth-increase rate.

scholarly journals Mixed community biofilms and microbially influenced corrosion

2018 ◽  
Vol 39 (3) ◽  
pp. 152 ◽  
Author(s):  
Enrico Marsili ◽  
Staffan Kjelleberg ◽  
Scott A Rice
Keyword(s):  
Single Species ◽  
Environmental Safety ◽  
Corrosion Process ◽  
Metal Corrosion ◽  
Mixed Species ◽  
Short Article ◽  
Microbial Biofilms ◽  
Microbially Influenced Corrosion ◽  
Biochemical Mechanisms ◽  
Mixed Community

Metals are used in most marine infrastructures for energy extraction and production. Metal corrosion is a serious concern, due to the environmental, safety, and replacement costs associated with it. Microbially influenced corrosion (MIC) contributes to the overall corrosion process, through several chemical, electrochemical and biochemical mechanisms, particularly in the presence of microbial biofilms. In this short article, we discuss briefly recent advances in MIC research, comparing corrosion in single species and mixed species biofilms, and outline possible strategies for biofilm and corrosion control.

Plant Growth Regulators Suppress Established Orchard Sod and Dandelion (Taraxacum officinale) Population

1989 ◽  
Vol 3 (2) ◽  
pp. 317-321
Author(s):  
Stephen S. Miller ◽  
B. Joe Eldridge
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Cover Crop ◽  
Ground Cover ◽  
Single Species ◽  
Apple Orchard ◽  
Mixed Species ◽  
Matter Production ◽  
Grass Growth

Several plant growth regulators applied to established sod driveways in an apple orchard suppressed growth of the ground cover sufficiently to eliminate one to three mowings. MH at 4.5 or 6.7 kg ai/ha applied spring and fall reduced the growth of a single species sod cover crop, ‘Kentucky 31’ tall fescue, the year after treatment. MH at both rates also reduced the dandelion population growing in the mixed species orchard sod. Paclobutrazol or EPTC applied in the spring before or during initial grass growth reduced dry matter production in the fescue sod cover crop and the number of mowings compared to the mowed and non-mowed control plots.

scholarly journals Density-dependent Growth of Endangered Labeo bata (Hamilton, 1822) in Nursery Ponds

2016 ◽  
Vol 9 (1) ◽  
pp. 67-73
Author(s):  
MA Samad ◽  
MM Rasid ◽  
MR Haque ◽  
AK Paul ◽  
H Ferdaushy
Keyword(s):  
Survival Rate ◽  
Growth Performance ◽  
Stocking Density ◽  
Ammonia Nitrogen ◽  
Average Weight ◽  
Mean Values ◽  
Labeo Bata ◽  
Survival And Growth ◽  
The Mean ◽  
Dependent Growth

The effect of stocking density on growth performance and survival rate of endangered Labeo bata, was conducted in nursery ponds from 14th June to 13th August, 2013. Three different stocking densities viz. 500, 600 and 700 piece-1 decimal were assigned as treatment T1, T2 and T3, respectively. The initial average weight of L. bata was 0.15±008 g. Hatchlings in all the nursery ponds were fed indigenous feed (26.95% crude protein) for 8 weeks. Temperature, ammonia nitrogen, pH had no significant differences (P<0.05). Final weight (g) was found to be the highest (4.06±0.06) in T1 and the lowest (3.20±0.03) in T3. The mean values of weight gain (g) was the highest (3.91±0.06) in T1 and the lowest (3.05±0.03) in T3. SGR was highest (5.49±0.02) in T1 and lowest (5.09±0.02) in T3. Yet again, survival rate was highest (70.33±0.88) in T1 where stocking density was the lowest among those aforementioned three treatments and lowest (61.00±0.58) in T3 where the stocking density was the highest among the treatments. And finally production (kg-1ha) was found highest (352.66±4.42) in T1 and lowest (337.50±3.19) in T3. Rearing of the Labeo bata fry in those three different stocking densities showed significant (p<0.05) variation both in highest survival and growth performance. Overall production of L. bata in treatment T1 was significantly higher than that of the other two treatments T2 and T3. Despite of this, consistently higher CBR was found from treatments T1 (1:1.78) than from treatment T2 (1:1.25) and T3 (1:1.06).J. Environ. Sci. & Natural Resources, 9(1): 67-73 2016

Reproductive potential of South African thermophilic Meloidogyne populations, with special reference to Meloidogyne enterolobii

Nematology ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 913-921 ◽  
Author(s):  
Milad Rashidifard ◽  
Mariette Marais ◽  
Mieke S. Daneel ◽  
Hendrika Fourie
Keyword(s):  
South African ◽  
Management Strategies ◽  
Reproductive Potential ◽  
Single Species ◽  
Mixed Species ◽  
Initial Experiment ◽  
Meloidogyne Enterolobii ◽  
Species Population ◽  
Rf Values ◽  
Single Species Population

Summary Variability in the reproductive potential of Meloidogyne spp. is crucial to design suitable nematode management strategies. The reproductive potential of nine South African single-species Meloidogyne populations, M. enterolobii (5), M. incognita (2) and M. javanica (2), as well as three mixed-species communities (each containing two of the three species) were determined in glasshouse experiments. A mixed-species community of M. enterolobii and M. javanica had the highest reproductive potential (Rf = 15.7) in the initial experiment. For the repeat experiment, a single-species population of M. javanica was the most injurious (Rf = 19.1). Conversely, a single-species population of M. enterolobii had the lowest Rf values in the initial (Rf = 1.0) and repeat (Rf = 6.1) experiments. Substantial variation existed in terms of the reproductive potential of M. enterolobii single-species populations and mixed-species communities.

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